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The technical method of densification of granular ceramic bodies and forming solid materials is called sintering. Sintering will be a blank in the body between the particles, a small amount of gas and impurities to exclude organic matter, so that the particles grow together to form a new method of material.

The heating device used in sintering is the most widely used electric furnace. In addition to atmospheric sintering, namely, no pressure sintering, there are hot pressing sintering and hot isostatic pressing sintering. Continuous hot-pressing sintering, although the increase in production, but the cost of equipment and molds is too high, in addition, due to axial heating, product length is limited. Hot isostatic pressure sintering using high-temperature high-pressure gas as pressure transfer medium, with the advantages of uniform heating, very suitable for the shape of complex products sintering. Because of the uniform structure, the material performance is higher than the cold pressure sintering 30~50%. Higher $number than the general hot pressing sintering. Therefore, some high value-added alumina ceramic products or the use of special components of FDN, such as ceramic bearings, mirrors, nuclear fuel and barrels, such as products, the field of heat and other static pressure firing method.

In addition, microwave sintering, arc plasma sintering and self propagating sintering technology are being developed and studied.